Research Publications (Food Safety)

Three important foodborne pathogens, Bacillus cereus, Listeria monocytogenes, and Staphylococcus aureus, are of great concern for food safety. They may also coexist in food matrices and, in the case of B. cereus and S. aureus, the resulting illnesses can resemble each other owing to similar symptoms. Therefore, their simultaneous detection may have advantages in terms of cost savings and rapidity.

Turkey skin is used as a source of fat in finished ground turkey products. Salmonella-contaminated skin may potentially disseminate this pathogen to ground turkey. The objective of this study was to determine and compare Salmonella levels (presence and numbers) associated with the skin of turkey parts (i.e., drumstick, thigh, and wing). Over a 10-month period, 20 turkey flocks expected to be highly contaminated with Salmonella based on boot-sock testing data of turkey houses were sampled.

The 2011 listeriosis outbreak attributed to whole cantaloupe involved several genetically distinct strains of serotypes 1/2a and 1/2b that had not been previously reported in invasive listeriosis outbreaks. Here we investigated the potential of strains from the 2011 cantaloupe outbreak to adhere, survive, and grow on cantaloupe rind and flesh and in juice extracted from cantaloupe at different temperatures (4, 8, and 25°C).

This study analyzed the behavior of Clostridium perfringens in individual ingredients and tamales containing different pathogen concentrations upon exposure to different temperatures and methods of cooking, storage, and reheating. In ground pork, C. perfringens cells were inactivated when exposed to 95°C for 30 min. Three lots of picadillo inoculated with 0, 3, and 5 log CFU/g C. perfringens cells, respectively, were exposed to different storage temperatures.

We investigated the effects of deep-frying or oven cooking on inactivation of Shiga toxin–producing cells of Escherichia coli (STEC) in meatballs. Finely ground veal and/or a finely ground beef-pork-veal mixture were inoculated (ca. 6.5 log CFU/g) with an eight-strain, genetically marked cocktail of rifampin-resistant STEC strains (STEC-8; O111:H, O45:H2, O103:H2, O104:H4, O121:H19, O145:NM, O26:H11, and O157:H7).

Numerous antimicrobial chemicals are currently utilized as processing aids with the aim of reducing pathogenic bacteria on processed poultry carcasses. Carryover of active sanitizer to a carcass rinse solution intended for recovery of viable pathogenic bacteria by regulatory agencies may cause false-negative results. This study was conducted to document the potential carryover effect of five sanitizing chemicals commonly used as poultry processing aids for broilers in a postchill dip.

An outbreak of listeriosis in late 2014 and early 2015 associated with caramel apples led to questions about how this product became a vector for Listeria monocytogenes. This investigation aimed to determine information about the survival and growth of L. monocytogenes in both fresh apples and caramel apples, specifically examining the effects of site and level of inoculation, inoculum drying conditions, and storage temperature. At a high inoculation level (7 log CFU per apple), L.

Publication date: November 2016
, Volume 69

Author(s): A.K. Bækbo, J.V. Petersen, M.H. Larsen, L. Alban

Publication date: October 2016
Source:LWT - Food Science and Technology, Volume 72

Author(s): M. Soazo, L.M. Pérez, G.N. Piccirilli, N.J. Delorenzi, R.A. Verdini

Publication date: October 2016
Source:LWT - Food Science and Technology, Volume 72

Author(s): Juliana Abigail Leite, Fabrício Luiz Tulini, Fernanda Barbosa dos Reis-Teixeira, Leon Rabinovitch, Jeane Quintanilha Chaves, Nathalia Gonsales Rosa, Hamilton Cabral, Elaine Cristina Pereira De Martinis

Publication date: October 2016
Source:LWT - Food Science and Technology, Volume 72

Author(s): Zahra Javidi, Seyed Fakhreddin Hosseini, Masoud Rezaei

Publication date: Available online 6 May 2016


Author(s): Mohamed Rhouma, Francis Beaudry, Ann Letellier

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Michelle Rengarajan, Arnold Hayer, Julie A. Theriot

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Publication date: November 2016
, Volume 69

Author(s): Xinfeng Han, Dongmei Zhu, Haimei Lai, Hang Zeng, Kang Zhou, Likou Zou, Congming Wu, Guoquan Han, Shuliang Liu

Summary

Summary

Publication date: November 2016
, Volume 69

Author(s): Danielle M. Conover, Kristen E. Gibson

Online Ahead of Print.

Online Ahead of Print.

Publication date: October 2016
Source:LWT - Food Science and Technology, Volume 72

Author(s): Juliane Alves, Elisa Yoko Hirooka, Tereza Cristina Rocha Moreira de Oliveira

Erin A. Urquhart, Stephen H. Jones, Jong W. Yu, Brian M. Schuster, Ashley L. Marcinkiewicz, Cheryl A. Whistler, Vaughn S. Cooper

Salmonella causes a range of diseases in different hosts, including enterocolitis and systemic infection. Lysine acetylation regulates many eukaryotic cellular processes, but its function in bacteria is largely unexplored. The acetyltransferase Pat and NAD+-dependent deacetylase CobB are involved in the reversible protein acetylation in Salmonella Typhimurium. Here, we used cell and animal models to evaluate the virulence of pat and cobB deletion mutants in S.

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